Answer:
NA=72.264x1023
Explanation:
I got you
In order for a cell to continue being efficient at exchanging materials, what must it do to maintain its surface-to-volume ratio as it grows larger
Explanation:
It will have to change its form in order for the cell to focus on developing and retaining a viable, in order to be large and narrow as in the situation of the nerve cells or to build a more 'contoured' surface, that is, to establish microvillus.
What is a neutralization reaction?
O A. A reaction in which the product is either acidic or basic
O B. A reaction that involves neutral reactants
O c. A reaction in which the reactants are a salt and water
O D. A reaction that removes essentially all Ht and OH
Answer:
D or A your choice
Explanation:
uhhh didnt u- nvm
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate wate
answer the pic below
Answer: 18
Explanation:
i think so
What is the volume occupied by 3.00mol of oxygen gas at STP?
If a wave has a frequency of 2.5 Hz and a wavelength of 3m, what is the speed of the wave?
Answer:
The speed should be 7.5
Explanation:
wavespeed (c) = frequency (ƒ) x wavelength (λ)
What do scientists do?
O A. They make sure all facts fit scientific theories.
O B. They learn about the world through observation.
O C. They use their knowledge to make public policy.
O D. They make ethical
HELP PLEASE!!!!!!!! I WILL MARK BRAINLIEST!!!!!!!
Answer: option d
MARK BRAINLIEST!!!!!!
What is the molarity of 350 mL solution that has had 32.0 g of NaCl dissolved in it?
Answer:
Molarity = 1.57 M
Explanation:
Given data:
Volume of solution = 350 mL (350 mL × 1L /1000 ml = 0.35 L)
Mass of NaCl = 32.0 g
Molarity of solution = ?
Solution:
Number of moles of solute:
Number of moles = mass/molar mas
Number of moles = 32.0 g/ 58.44 g/mol
Number of moles = 0.55 mol
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.55 mol / 0.35 mL
Molarity = 1.57 mol/L
Molarity = 1.57 M
How many moles of phosphoric acid are there in
658 x 10 28 formula units
of phosphoric acid, H3PO4
Answer:
109.3 × 10⁵ mol
Explanation:
Given data:
Number of moles of phosphoric acid = ?
Number of formula units = 658 × 10²⁸
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole contain 6.022 × 10²³ formula units,
658 × 10²⁸ formula units × 1 mol / 6.022 × 10²³ formula units
109.3 × 10⁵ mol
How many molecules are there in 2.3 grams of NH4SO2
Answer:
Explanation:
First, calculate the molar mass of NH4SO2. The molar mass can determine the number of moles. Then use Avogadro's number to calculate the number of molecules.
Key Steps:
Step 1. Calculate the molar mass of your compound
Step 2. Divide 2.3 grams by the molar mass of NH4SO2, this gives us moles
Step 3. Multiply by Avogadro's number (6.02x10^23) this gives you molecules.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.68×10²²molecules are there in 2.3 grams of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
moles of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex]= 2.3 grams ÷82.10g/mol
=0.028moles
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of atoms/molecules of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex]=0.028 × 6.022×10²³
=1.68×10²²molecules
Therefore, 1.68×10²²molecules are there in 2.3 grams of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex].
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ2
Based on the data, summarize Alicia's results.
Describe how stirring the soup affects heat transfer.
How many pairs of electrons are shared in a double bond?
A. 1
B. 2.
C. 3
D. 4
Answer:
B. 2
Explanation:
A double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair
B
A Double bond is when two atoms share two pairs of electrons with each other. It is depicted by two horizontal lines between two atoms in a molecule
Provided here is an unbalanced chemical equation.
CuCl2 + Na3PO4 Cu3(PO4)2 + NaCl
Which of the following shows the product side of the correctly balanced equation?
please help!!!!
Answer:
3CuCl₂ + 2Na₃PO₄ → Cu₃(PO₄)₂ + 6NaCl
Explanation:
The reaction expression is given as:
CuCl₂ + Na₃PO₄ → Cu₃(PO₄)₂ + NaCl
To balance this expression, let us assign coefficients a, b, c and d;
aCuCl₂ + bNa₃PO₄ → cCu₃(PO₄)₂ + dNaCl
Conserving Cu: a = 3c
Cl: 2a = d
Na: 3b = d
P: b = 2c
O: 4b = 8c
let as c = 1, a = 3, d = 6 , b = 2
3CuCl₂ + 2Na₃PO₄ → Cu₃(PO₄)₂ + 6NaCl
Explain why the following statement is either true or false: The idea that all matter
consists of the elements was first introduced a few hundred years ago.
Answer: true
Explanation: For about 2000 years, people accepted Aristotle's idea that all matter is made up of just four elements: earth, air, water, and fire. Starting about 500 years ago, scientists began discovering all of the elements that are known today
solve this question please
Answer:
Check explanation for answer
Explanation:
Let's analyze each reaction per separate and explain the reason of the type of reaction:
a) CH₃CH₂CH₃ + 5O₂ -------> 3CO₂ + 4H₂O
Type of reaction: Combustion
In this case, the combustion is a reaction where a compound reacts with a molecule of oxygen to produce, in almost every case, CO₂ and H₂O. Therefore, this reaction can only be a combustion. It cannot be combination because combination requires two compounds to be combined and formed, in most of the cases, one product. In this case we have two. It can be similar to a double displacement but not combination.
b) KOH + HClO₄ --------> KClO₄ + H₂O
Type of reaction: Acid base reaction, double displacement.
This is clearly an acid base reaction cause we have an acid (HClO₄) reacting with a base (KOH) to produce a salt and water. It's also a double displacement reaction, because as you can see, the atom of Potassium (K) is displacing the H, and the H displaces the K simultaneously, and form two new products.
c) CH₃CH₂OH + 3O₂ -------> 2CO₂ + 3H₂O
Type of reaction: Combustion
The reason, the same for case a).
d) CuSO₄ + ZnCrO₄ ---------> CuCrO₄ + ZnSO₄
Type of reaction: Double displacement and precipitation
In this case, it's pretty similar to case b), The Cu replaces the Zn in the CrO₄, while the Zn replaces the Cu with the SO₄. But it's also a precipitation because the CuCrO₄ that was formed is in solid state, and if the reactants were in aqueous state and a solid was formed, this means that this solid is precipitating from the reaction. Therefore, it's a precipitation reaction too.
Hope this helps
15 pts! Explain how the absorption of energy (heating) affects the speed of the particles in a substance.
Answer:
See explanation
Explanation:
Temperature has been severally defined as the measure of the average kinetic energy of the molecules of a body. Heat is a form of energy that exists due to temperature difference.
Given a body whose molecules has a speed = (3RT/M)^1/2; this implies that for a given mass of the substance, the velocity of its particles depends on the temperature of the substance.
However, absorption of heat increases the temperature of the body. Therefore, when heat is absorbed, the temperature increases and the speed of the particles of a substance increases according to the relation above.
Explain how you would change a solution with an original pH of 8.0 to have a pH of
12.0?
Answer: Acidity and basicity, proton concentration, the pH scale. You may have noticed that acidic things tend to taste sour, or that some basic. Since the scale is based on pH values, it is logarithmic, meaning that a change of 1 pH unit .
Explanation: PLEASE MARK ME AS BRAINLIEST
What does it mean for a material to be brittle?
A. It bends easily when pressure is applied.
B. It breaks when pressure is applied.
C. It changes shape when pressure is applied.
D. It stretches into thin strands when pulled.
Answer:
B. it breaks when pressure is applied.
A sample of chlorine gas has a volume of 6500 ml at STP. What will the volume be if the temperature is increased to 50.°C and the pressure is decreased to 0.25 atm?
Answer:
The volume will be 30759mL
Explanation:
To solve this question we need to use the combined gas law:
P₁V₁/T₁ = P₂V₂/T₂
Where P is pressure, V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas
Computing the values (STP are 1atm and 273.15K):4
P₁ = 1atm
V = 6500mL
T₁ = 273.15K
P₂ = 0.25atm
V₂ = ?
T₂ = 273.15K + 50°C = 323.15K
1atm*6500mL/273.15K = 0.25atmV₂/323.15K
V₂ = 30759mL
The volume will be 30759mLTo describe a rock's texture, geologists determine
Answer:
the size, shape and orientation of mineral grains
Explanation:
To describe a rock's texture, geologists determine the size, shape and orientation of mineral grains.
Texture deals with the relationship between minerals within a fine mass.
Rocks are aggregate of minerals and they are fundamental building blocks of rocks. We can observe rock textures by merely looking at it with our naked eyes. Also, we can obtain thin slices and sections of rock to have a closer look into the rock.Which of the following is the best definition of a physical property?
A. Something that can be observed or measured while changing the identity of the substance.
B. Tearing paper in half.
C. Something that can be observed or measured without changing the identity of the substance.
D. The ability of something to undergo a change or reaction.
Answer:
The answer is either A or C figure it out sorry
The answer is A) Something that can be observed or measured while changing the identity of the substance. C) Something that can be observed or measured without changing the identity of the substance.
What's a physical property and examples?A physical asset is a function of count that isn't associated with a change in its chemical composition. Familiar examples of bodily homes consist of density, coloration, hardness, melting and boiling factors, and electric conductivity.
Physical homes are those popular properties you word maximum readily approximately a substance, including its length, state of being counted (stable, liquid, or gas), color, mass, density, and power. Values for physical residences can be determined via tests that do not modify the substance being tested.
The definition of bodily is matters which are of nature or of the frame. An example of physical is plantlife developing in the ground. An example of physical is a person constrained to a wheelchair because of disabilities. A bodily exam.
Learn more about the physical property here: https://brainly.com/question/12330204
#SPJ2
Please help fast it's timed!
The subscripts in any molecular compound determine the ratio of atoms in a sample of the substance.
True
False
How can rocks be distinguished from each other?
Their shape can distinguish rocks.
All types of rocks have different density.
Different types of rocks have different chemical composition.
Each type of rocks is different in color.
Answer:
Different types of rocks have different chemical composition.
Explanation:
Rock can be distinguished from each other by their chemical composition which is a product of the minerals they contain.
A rock is an aggregate of minerals. Different suites of rocks have their inherent mineralogical composition and facie. This is because, these rocks form under different types of conditions from time to time. Igneous rocks form from molten rocks, sedimentary rocks form from pre-existing rocks and metamorphic rocks for under elevated temperature and pressure conditions. All these conditions plays important roles in the differentiation of minerals in the rock.a base is defined as a compound that produces
PLEASE HELP DUDE SOON
The outermost shell is the
energy level that
contains in an atom.
Answer:
True hope this helps
Explanation:
Based on what you know about prokaryotic cells and
eukaryotic cells, the bacterial cell shown in the Venn diagram
below is a _____________________ cell while the fungal cell
is a __________________________ cell.
Answer:
based on what you know about prokaryotic cells and eukaryotic cells the bacterial cell shown in the venn diagram below is a prokaryotic cell while the fungal cell is a eukaryotic
Explanation:
hope it help and if it doesnt sorry ;)
List these from smallest to largest- Molecules, Mixtures, Atoms
Atoms Molecules mixtures
A population of large predator
fish has recently grown out of
control. How will this impact
the ecosystem?
Answer:
they will eat a lot of fish and make other animals go hungry
Explanation:
logic
As the population of large predator fish has grown out of control it will require more supply food due to which population of small fishes will decrease leading to disturbance in ecosystem.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/19267717
#SPJ2
Select the correct answer.
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
OA
carbon + oxygen + carbon dioxide
OB.
carbon + oxygen - carbon dioxide
O c.
carbon dioxide. - carbon + oxygen
OD.
carbon dioxide + carbon - oxygen
Answer:
The answer is option OB.
Answer: B) carbon + oxygen - carbon dioxide
Explanation: The symmetry of a carbon dioxide molecule is linear and centrosymmetric at its equilibrium geometry. The length of the carbon-oxygen bond in carbon dioxide is 116.3 pm, noticeably shorter than the roughly 140-pm length of a typical single C–O bond, and shorter than most other C–O multiply-bonded functional groups such as carbonyls. Since it is centrosymmetric, the molecule has no electric dipole moment. As a linear triatomic molecule, CO2 has four vibrational modes as shown in the diagram. In the symmetric and the antisymmetric stretching modes, the atoms move along the axis of the molecule. There are two bending modes, which are degenerate, meaning that they have the same frequency and same energy, because of the symmetry of the molecule. When a molecule touches a surface or touches another molecule, the two bending modes can differ in frequency because the interaction is different for the two modes. Some of the vibrational modes are observed in the infrared (IR) spectrum: the antisymmetric stretching mode at wavenumber 2349 cm−1 (wavelength 4.25 μm) and the degenerate pair of bending modes at 667 cm−1 (wavelength 15 μm). The symmetric stretching mode does not create an electric dipole so is not observed in IR spectroscopy, but it is detected in by Raman spectroscopy at 1388 cm−1 (wavelength 7.2 μm).
Can somebody who knows these for sure!! Answer the true or false questions plz thanks!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DD
Answer:
good luck
Explanation:
1. false 2. True 3.False
4.true
5.true
Answer:
1.False
2.False
3.True
4.True
5.True